Right now I’d point you at wiki.xen.org/xenwiki/Fedora13Xen4Tutorial since I’m using that as a base and expanding on it. (Also, I got tired of trying to update the Fedora 14 info that I tried to mix in.)
If you’re Linux only though (as in you’re already running X), ssh -X @ on your client, followed by whatever command you want on your server (over the SSH connection) should work.